jquery – .net core DataTables – sending null parameter via ajax to server

I have the following datatable with server-side pagination:

    $(document).ready(function () {
            pageLength: 10,

            dom: '<"html5buttons"B>lTfgitp',
            buttons: [
                { extend: 'excel', title: 'ExampleFile' }
            "proccesing": true,
            "serverSide": true,
            ajax: {
                type: "POST",
                url: "url",
                contentType: "application/json; charset=utf-8",
                dataType: "jsonObject",
                data: function (dtparams) {
                    return JSON.stringify(dtparams);
                dataFilter: function (res) {
                    var parsed = JSON.parse(res);
                    return JSON.stringify(parsed.d);
                error: function (x, y) {
                "filter": true,
                columns: [

and my method on the server side:

  public async Task<IActionResult> GetFilteredItems(string clientParameters)

My problem is that the client parameters sent to the server are null but when I debug on the client side I can see the object like this:

enter image description here

I know there are some similar question about this, but I’ve tried some of those approaches like sending the object as Json.

Any ideas on this?

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